#include<stdio.h>
#include<math.h>
main()
{
    int n,a,b;
    printf("There are following numbers with 4 digits satisfied condition:\n");
    for(n=1000;n<10000;n++)
{    
    a=n/100;
    b=n%100;
    if((a+b)*(a+b)==n)
    printf(" %d",n);
}
}